Automatic telephone system.



' GI GRAB'E.

. AUTOMATIC TELEPHONE SYSTEM.

APPLICATION rum) Inks, 1913.

l 1 24:,608o Patented Jan. 1 2, 19" :3

3 SHEETS-SHEET 2.

' v t m I we a5? G. GRABE.

4 AUTOMATIC TELEPHONE SYSTEM.

APPLICATION IILED PBB.8, 1913.

Patented Jan. 12; 1915 enone eimnn, .onmxbnassnn, NEAR BERLIN, GERMANY, assienon .TO sInzaEii-s -& .IHALSKE, A. OFQBERLIN. GERMANY, A conronarrou or GERMANY.-

- AUTOMATIC rELnPHoNE SYSTEM.

.- Specification of Letters Patent. I t t 1. 1915,-

Application meai eiiru r s. 1912.. Serial in. 747,107.

To tlZZ'whom it may concern: I Be it. known that I, (irons GRABn, ac ti- Zen-of the'- German Empire, and residing at phone systems comprising sielectors whose terminals are not arranged according to the decimal system.

'Inaut-Inatictelephone systems the sub-' 'sdribe'rs ines-are divided at the exchange -,'into"groups. Each of these groups of subscribers lines has a number of trunk-lines,

oi'erwhich the connections betwee'iithe subscribers blongmgto one group are made to the subscribers belonging to the same or tor-another group, "The-number of these trunk lines is" only large enough to suffice for the greatest number of. conversations carried on simultaneously by the subscribh ers. Ii." the 'suliscribersi lines: are subdivided into small groups, it may happen that the trunk linesof the various groups are very represent three geometrical figure's indicating unequallyutilized 'an'd thatw'ery many sub scribers in the one group may vbe speaking while the other groups almostn'o speak- 'ing Whatever takes place. If, the subscr bers ,lines'are'dividedinto larger groups,

" suclidiii erences are better equalized and,-

with an equal'total number of trunk lines .in thehole of the exchange, a better ut1h-.

.' zation ofthe trunksis possible, or the 1mmher of terminals necessary to sufli ce for the largest number of conversations is reduced.

As a rule, the, subscribers lines are subdi- 'vided. iirto groups of one hundred, and practice has shown that in most cases ten trunk lines per group of subscribers lines sufiice. If, however, the subscribers lines are. subdivided into groups of two hundred, sixteen trunk lines per two hundred subscribers Will suflice. If the groups are enlarged it is necessary-to use selectors having consid- 'i erably more terminals than the usual se: vlectors arranged tor-"a l00-group'. Since n such selectors the terminals or connection contacts are no longer arranged in ten rows each of ten: contacts, and 'sinoe, the current impulses emitted by the subscriber are issued in accordancerwith the decimal syste.n1, .thesecurrent impulses cannot beemploye for the adjustment ofv these enlarged selectors. i

' ance with the decim:

connected to four c selector GVV in such mannerthat by'iad- -According to my nvention'I arrange that the trunks which lead to these selectors are connected at several places to the selectors of a pre fious stage, and-are provided with such devices that, according to the adjust ment bf the selector on the'one' or other ter' .nnnal oi; the trunk him, the selector to be adjusted can make connection With-only a portion of the terminals. In thi's'mann'er by setting the selector of the preceding stage a-group of contacts of the line connector can beselected, and the 'numberof contacts or terminals in this group is so small thatan adjustment of the selector Within this group can be readily effected by the current'impul es delivered in accordl system. .Several illustrative embodiments of my invention are represented 'by way' ofexjample, in the accompanying drawing, wherein Figures 1 to. 5 are diagrams for explaining the invention, and .Figs. '6 to 9 show four forms of the invention. Referring to the drawings; Figs. 1 to 3- the distribution of the terminals or contacts of such selectors for more than onehundred connections. The rectangle shown in Fig.

justing the. selector 'GlV on't bne of these four lines of the trunk one of the four squares of the connector Lly is simultaneously selected. .I

In Fig. 5"the f our lines which lead from the selector G-W the, connector Ll" are, assembled to i0 =onej single. trunk which divides into ,i'ou n ches only at the end a device which is indicated by a relay'and .leadingtosthe selector GlV :and these which so acts that when the selector Gl i is placed on .icentain branch, the 001111 LW is.caused to select only; in th e' of'the field of contacts wh'i-zch co to the selected branch.

The selector may be arrang din a sired manner. It may, for 'e. prise four dili'erent sets of brushe are normally locked, andone of whi -is released by occupying one of the branches at the selector Gi whereupon the brushes.

selector: has. according to the known Strow-- ger systern spindle which is vertically displaceabl'e and rotatable, so that by raising this spindle, a certain bank of contacts 1s firstiound, and by rotating it a definite contact in this bank is selected. The spindle of theselector V carries two sets of brushes a 6 c and a I2 0 which'are connected with the trunk leading to the selector GlV only whe'n the relay P or P respectively is '-energizecl. The trunk line from the selector is connected at this selector to two differentr sets of contact-pieces g and g, v

a This system'of connections operates in the following manner :As soon as the subscriber by using his two keys T T has adjusted the selector GV on the contact-pleces g, a circuit is closed from ground, over the resistance '10, the winding of the relay P, to the battery. The relay P serves to produce the engaged voltage in the test line of the trunk line leading to the selector V. The subscriber T now uses his keys T T to adjust the selector XV on the contact-pieces G. These current impulses are transmitted by the relays A and B to those circuits of the selector W which serve for the elevation and rotation of its spindle. As soon as the selector is adjusted on the contact-pieces g, the relay P is energized by way of the back contact oi the relay R and the brush 0. and connects the brushes (4 6 to the trunk leadingfrom the selector'GW'. The subscriber T is thereby connected with the subscriber who is connected to the contact-. pieces G. Should the subscriber T desire'to be connected with subscriber ho. 8&2 who is connected to the contact pieces G he does not adjust the selector GW' on the contactpieces 9, but on the contact-pieces g lhe relav R is thereby energized, and opens the contact 1', and closes the contact 93. The relay P is thereby disconnected and instead thereof the relay is connected in circuit. so that when the brush 0 becomes connected with the test-contact of subscribers N o. 342, the relay P is energized). mid-mow connects the brushes b, with thertrunlt leading from the selectorGlV.

Fig. '7 represents a siinila'r system, wherein the selected sets-ct brushesarejconnected notby means of test 1ela y s,-P ,IP,, but'by means of the relay {The subscriber Tholjusts the selectors Gi l/ G Wisineimcfly he same manner as describedabpve with reference to Fig. 6. Theline wean leads from the selector V to the selector, GV is not provided with double connection contacts at the selector GW' f-bnt them double connection contacts are already presentat the se lector GVV Accordi'iig-as-the selector ew. has been. adjusted enthe contact-pieces which are connected to the upper selector Gl V or the lower selector GW the relay R remains currentless or is'energized. After the selectors GlV and- Glv fhave-been adjusted, the selector W is adjusted, whereupon the test-relay 'P connects through the trunk line.

The connection in Fig. 8 differs from those shown in Figs. 6 and 17,.in that the selector \V comprises only one set of brushes. The trunk line is connected exactly as in Fig. 6 to the contact-pieces g and g, of the selector Gi l", and according as the selector Gil is adjusted on the contact-pieces g or 1 the relay R rema1ns.cu-rrentless or is energized. lVhen the, relay-R remains currentless a completely normal adjustment of the selector \V takes place. whemhoweyer,

the relay R attracts its armature, the relay- ..k becomes first of all alternately currentless and ener ized owing to the current impulses given by the subscriber, whereas during these impulses therelay B remains encrgized. Owing to the relay A being intcrniittently energized, a number of current impulses is set up through the lifting mag netl-l and the operating contact of the relay A, whereby the spindle of the-selector W is raised one bank of contacts.

7 Owing to the relay B being energized the relay U also becomes energized, its circuit being completed at the contact 6 As soon as the relay U attracts its, armature, it

closes a holding circuit over the contact whereby it then remains energized when the relay 15 becomes currentless after the succession of current impulses has been deli;- ered. The relay U, moreover, causes contacts u and u, to be'closed, w'l'iereby t lifting magnet-H is switched out of, and rotary magnet D switched into circ I? ow as soon as the relay B, becomes ourrentless after the delivery of the current impulses, the relay F is energized over the contact in, contact 1- and contact 6 The relay]? closes the contact f whereby it then relay F being energized, the contact 7'.

remains energized w .en the relay B shortly thereafter attracts lts'armature. Owing to made and the rotary magnet D is COIIIIQ." e by way of a contact W to an interrupter; the latter delivers ten current impulses in quick succession. The rotary magnet D,

therefore rotates the spindle of the. connector *W first of all ten steps. When the subscriber now. gives the last succession of impulses corresponding to the unit integer desired, the relay A becomes again alternately currentless. and energized, whereby the rotary magnet D again receives the current impulses delivered by the subscriber. If the subscriber sends a. g. five impulses, the rotary magnet .D altogether receives fifteen impulses and the selector W isadjusted ,onto the fifteenth contact of the. previously selected'bank. In this figure a constructionof selector W'is assumed comprising ten horizontal banks each of twenty contact-pieces. It will, of course, be readily understood that the field ofcontacts of the selector may have twenty horizontal banks each of ten contact-pieces. In this case the current impulses delivered overthe contact w must flow over the magnet H before the impulses for lifting the spindle of the selector are delivered.

The connection illustrated in Fig. 9 contains a trunk line which is connected to the double contact-pieces g, 9 of the selector GW. In contradistinction to the other hereinbefore described embodiments of my invention the relay R is however dispensed with. The spindle V of the selector GIV carries, in addition to the three brushes (1, b, 0-, a vertically displaceable contact-piece f which is raised in steps simultaneously with the spindle, and after each odd number of steps closes a contact 1, 3, 5, '7. This contact-piece f is, moreover, connected with an impulse sender J, which, when the selector GFW is on one of these contacts 1, 3, 5, 7 sends out the ten additional impulses to the next selector IV. If the-calling subscriber adjusts the selector GIV onto an even bank of contacts in which the contact f is open, the next selector G'is adjusted in the usual j manner. Should, however, the

subscriber T so adjust the selector G W that the contact 7 is made, the selector W seeks in the usual manner a disengaged seto. contacts, the relay P then attracting its armature.v This relay closesthe contact p whereby a current flows from the battery.

over the switch-controlling magnet S, the arm 82, the interrupter V,, the, contact pto ground; the magnet S so obtains 'ficurren't impulse and moves the arms 8,, s .9 of the switch into the second position. i In this position the relay B becomes energized by way-of the contact-arm 8 the contact faand "the ground at the subscribers end T, the

over the contact arm r;,, and the magnet D,- to ground. Themagnet I), now rotates the impulse-sender J once. -The arm 2' of the impulse sender J moves over a number of grounded' contacts '13,, and thereby produces current impulses which flow over the arm .9 the'brush a of the selectorGiV, and the relay A, and

the interrupter Y.

becomes cnrrentles's, whereby hence intermittently energize the latter.

Therefore he magnet H of the selector W" is intermittentlyenergized and the spindle of this selector is raised ten steps. As soon as the arm i has completed one revolution, it closes for a moment the contact i the magnet S consequently receiving a current impulse and the switch SS being moved into the fourth position 4s, in which position .the current impulses sent by the switch ,J'

are stopped. Further adjustment of the selector W' is now eifected in precisely the same manner as described above with-refer ence to the other figures.

I claim:

1. In an automatic telephone exchange,

the combination with selectors, of connectors having movable contacts and stationary te ephonc line contacts arranged in rows in a non-decimal system, trunk lines leading 'from the movable contacts of said-'connectors to different contacts of the'selectors of a previous stage, ant. .neans as ociated with these selectors and connectors whereby, when the, selectors. make connection with one of said different contacts of the trunk line, the connector is caused to select only ina part of said telephone linecontacts.

2. In an automatic telephone exchange, the combination with selectors, of connectors having movablecontacts'and stationary telephone-Kline contacts arranged in rows in a non-decimal system, trunk lineslead ing from the movable contacts of said @011 nectors to diflerent contacts of the selectors of a previous stage-test circuits associated with the trunk lines. and adaptedto'determine by which of the different contacts of the trunk lines connection is made by the selector, and means associated with these test circuits adapted/ to cause'the connector to s'elect iu a part of the-telephone line I contacts "in dependence on the test circuits. In an automatic t'eicohone exchange the combination with selectors and connectors having movable contacts and stationary telephone line contacts arrangcd iii-rows, said rows comprising more. than ten contacts, and trunk lines leading from. the

movable contacts of said connectors to dif-' ferent contacts of the selectors of a-previous' stage, test circuits a'ssociated witli the trunk lines and .adaptedft'o determine by which of said different terminals of the trunk lines the connection is made by; the selector, and,

means associatedwith -t'h'ese test circuits adapted tosend ten supplementary .in1-' pulses'when theino-vable part of theconnector must make more than ten steps in order to reach thedesired contacts.

- 4, In' ,an automatictelephone exchange the c'ombinationwithselectors and connectors having movable contacts and station--.

ary telephone linecontacts arranged in. rows, said'i-ows comprising more than ten contacts, and trunk lines leading from the .movable contacts of said connectors todifjterent contacts of the selectors of a previous st'a ',t'est circuits associated w th thetr'unk;

linesand adapted to determine by which of said'different terminals of the trunk lines connection ismade by the selector, f and means asseciated l with, said test ,cir-c its adapted fto send ten supplementary ii ipulses when' the'.movab'lepart ofthe con-'' 'nector must make more thanten steps in order to reach the desired contacts, said supplementaryimpulses be ng sent through the trunk lines, by' which connection with the coniiectoiyis established.--

5..In an automatic telephone exchange the combination with selectors and-connec- "tors having movable contacts and stationary 1 telephone. line contacts: arranged in rows, said rows compris ng .more than tent-cont acts, trunk lines leading from the movable contac'ts'of-said connectors to different con-.

tacts otthe selectors of a previous stage, test circuits adapted to .determiiie'by which 0t said ditterent terminals" of the trunk" line connectionis made. by the selector, and interrupters associated with the test circuits adapted to-produce-ten supplementary im-g pulses when" the movable part oftheconnector must make more than ten steps in order to reach the desired-contacts, saidfintera rupters beinggassociated with that "selector whose stationary contacts are connected phone lines being differentiated by digit setting switches operated before operating said connectors, trunk lines leading from different contacts of the selectors of a previous stage, the-trunk line contacts of said selectors by which connection is made to d fferent hundredsgroupsot telephone line I pulses when the'movable' part of the con- .nector .must inakeinore, than ten steps in I with the contacts of the. same thousands grouv e'ing arranged in the same group 01 selectors,

trunk. lines leadingfrom the movable contactsof said connectorsto different contacts of the selectors of a previous stage, test circuits .adaptedto determinesby which of saiddifferent terminals of the trunk line connection is made by the selector, and-interi'upters associated'with'th'e testcircuits adaptedto produce ten supplementary im;

pulses When'the mova le vpartfof the connector must makein'io e than-ten steps in order to reach the desired contacts, said-interrupters being associated with that selec tor whose stationary contacts are connected line. i. I

7;; In [an automatic telephone exchange the combination with selectors and connectors havingmovable contacts'and stationary telephone line contacts arranged lll'IOWS, said rows comprising more than tencont acts',-ea ch hundred ofitele'p honejine con-' tacts having digitsina place higher than the hundreds differing from the other hundreds of telephone line contacts at the same' different terminals of the trunk connector, trunk lines leading from' the movable contacts of said connectors to dif ferent contacts of the selectors of a'previous stage. the trunk line contacts of said selec-i tors by which connection is made, to differ- 4.

ent hundreds: groups of telephone line'contacts of the'same 'thousands' group beingarranged' iirthe same group of selectors, 'test circuits adapted'to determine bywhich of said difi'erenttermin als of the trunkline connection is made by the selector, and in- ;terruptersassociatedwith the test circuits adapted to produce ten supplementary imorder to reach the desired contacts, said interrupters'being associated -with-that se lector whose stationary contacts arev con v nected with the different terminals of the trunk line. i

' 8. In an'automatic telephone exchange the combination with selectors and connec-- tors havingmovable contacts and stationary telephone line contacts arranged 1n rows,

said rows comprising more than ten contacts, each' hundred of telephone linec'ontacts having digits in a place higher than the hundreds differing from the other hunthe movable contacts of said connectors to;

"dreds of telephone line contacts at the same connector, trunk lines leading from the moi"- ablecontacts of said connectors to different contactsof the selectors of a previous stage, the trunk line contacts of said selectors by which connection is made-to diiferent hundreds gro ips of telephone line contacts of .the same thousands groups being. arranged in the same group'of selectors, test circuits adapted to determine by which of said different terminals of the trunk line connec 1,124,eos

tion' is wide by the selector, said circuits being'only at the outgoing end of the trunk "line, and interrupters associated with the "test circuits adapted to produce ten supplementa ry impulses When the movable part of the connector must make more than ten steps in order to reach the desired contacts,

said 'interrupters beingassociated with that selectorwhose statlonary, contacts are connected with the difiei n t terminals of the GEORG GRABE.

Witnesses:

' HENRY HAsgmn,

WOLDEMAR HAUPT. 

